Abstract: The present invention relates to the technical field of agricultural pest control, and more particularly, to the application of pyrrole-2-carboxaldehyde in controlling plant root-knot nematodes. Pyrrole-2-carboxaldehyde and agronomically acceptable salts thereof have strong insecticidal activity against root-knot nematodes. Pyrrole-2-carbaldehyde shows the advantages of high efficiency, low toxicity and low residue compared to other insecticides and is more compatible with the environment, which meets the needs of green plant protection and sustainable agricultural production and development.

Abstract: Disclosed is a method of determining causes of intrinsic oscillations in a double-barrier quantum-well intrinsic oscillator comprising developing an emitter quantum-well (EQW) from a double-barrier quantum-well system (DBQWS); coupling the EQW to a main quantum-well (MQW), wherein the MQW is defined by double-barrier heterostructures of a resonant tunneling diode; using energy subband coupling to induce quantum-based fluctuations in the EQW; creating intrinsic oscillations in electron density and electron current in the DBQWS; forming a distinct subband structure based on the intrinsic oscillations; and identifying a THz-frequency signal source based on the quantum-based fluctuations, wherein the intrinsic oscillations comprise maximum subband coherence, partial subband coherence, and minimum subband coherence, wherein the energy subband is a quantum mechanical energy subband, wherein the intrinsic oscillations occur proximate to a bias voltage point in the range of 0.224 V and 0.